I want to put rear lap belts in my '60.

There are two bolts on either side of the transmission tunnel through the floor that definately look like seat belt anchor bolts because they are reinforced on the underbody and don't attach to anything else. So that would give me half an outside belt, a full middle belt and half an outside belt.

So where do the other halves of the outside belts anchor at the sides of the car? I cannot find any more bolts or holes through either the floor or the sides.

Also, how long are the rear belts? I picked up what was supposed to be rear belts from Whitney, but at 60", they are too long.
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'86 745T, '72 144E, '70 145S, '68 220S, '60 544

The side holes are likely behind the finishing panel, others will certainly chime in.
The belts can usually be shortened at the anchor so less is "slopping" over.

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Mike!